Can We Use Flow Activity As A Diagram In Usecase Activity Diagrams – Advantages, Disadvantages and Applications of Use

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Activity Diagrams – Advantages, Disadvantages and Applications of Use

Activity diagrams describe the actual behavior of a system’s workflow in information technology. These diagrams are very similar to state diagrams because the activities are the actual state of the work. These diagrams describe the actual state of system activity by showing the complete sequence of activities performed. These diagrams can also show activities that are conditional or parallel.

When to use: Activity charts

Activity diagrams should be used in conjunction with other modeling techniques such as interaction diagrams and state diagrams. The main reason for using these diagrams is to model the workflow behind the system being designed. these diagrams are also useful for use case analysis by describing what actions should be performed and when they should occur, by describing a complex sequential algorithm, and by modeling applications with parallel processes.

Advantages of Activity Diagrams:

  • The UML modeling language included that these diagrams are usually easy to understand for both analysts and stakeholders.
  • In UML for the IT Business Analyst, the “Activity diagram is most useful for the IT BA to show the flow of work [because] it’s simple to understand – both for business and end users.”
  • Being among the most user-friendly charts available, they are generally considered an essential tool in the analyst’s repertoire.
  • Additionally, as mentioned above, activity diagrams allow the analyst to display multiple conditions and actors in a workflow using swimlanes. Swim lanes are optional, however, as a single condition or player is usually shown without them.

Disadvantages of Activity Diagrams:

The UML modeling language includes that these diagrams can become too complex because their user-friendly nature can lend itself to an all-encompassing description. In other words, since it’s so easy to display project-related information, why not include them all? When an analyst has a large project, it can be tempting to create a single, overly complex diagram.

However, as one author notes, “If you use activity diagrams to define the structure of your workflow, you should not try to explore the multiple levels of activity graphs down to their most ‘atomic’ level”. Instead, the analyst should try to present a new diagram for each workflow or, if more appropriate, use swimlanes to represent different actors within the same workflow.

Another aspect of these diagrams is that they should not be used in place of a state diagram or a sequence diagram because “activity diagrams do not provide details about how objects behave or how objects interact.” This is not a disadvantage in itself, but it is important for the analyst to consider when using diagrams in their work.

In short, activity diagrams are fairly easy to adopt and will be useful for most projects because they simply and moderately clearly show how things work.” Unlike many diagramming techniques, these diagrams also allow for multiple choices and actors within workflows to be shown and are easy to follow. even for non-technical users

Using an Activity Diagram:

This diagram has been extended to specify flows between steps that transfer physical matter (eg gasoline) or energy (eg torque, pressure).

  • Additional changes allow the diagram to better support continuous behavior and continuous data streams.
  • The UML 2 specification significantly extended the characteristics and scope of activity diagrams beyond their previous classification as a special case of state diagrams.
  • Today, activity diagrams can be thought of as flowcharts for the 21st century, and UML modelers use activity diagrams to describe them.
  • These diagrams are also useful for the following methods:
  • Business rules
  • Functions that occur in parallel
  • A complex chain of multiple use cases
  • Software flows and logical control configurations
  • Procedures with evaluation points and alternative streams
  • Disposable cases

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